Sponsorships?

Does anyone know if (or have any experience with) asking a company (like Wendy's fast food) to sponsor you would work. I am thinking about asking a company like that to pay me in return for me putting a patch with their logo or something like that one my tennis close (like the pros sometimes do). If anyone has any experience with this or some advice, your input will be appreciated.
Thanks.

I've been paid for over 50 endorsements. Most came to me. However, You might be able to do it.
These are some of the questions they will have in their head regarding you.
"What do you have to offer the company?"
Are you the best in your division, age, section?

"Are you able to talk intelligently about their product?"
If not...better research the company and I don't mean their burgers either.